To Landscapers with 5DII

Do you think that 5dII has everything you need for Landscape photography? If you had the bucks to change to 5DIII, would you buy 5DIII or invest it in lens?

I am going FF since I´ve got a 1DIV and need the wide angle view, so I am deciding to buy a 5DII or a 5DIII (no 6D). If I go with 5DII I won´t get an used 5DII because it´s a “small” difference in price (about 400€) but a big difference with the warranty (I work in wet and harsh places, so I better have a warranty).